TM-9-2350-311-20-1
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS
AUGUST 1994
TM-9-2350-311-20-1 - Page 24 of 1275
TM 9-2350-311-20-1
1-13 CAPABILITIES AND FEATURES — CONTINUED
1-13.2 Powerplant (Engine and Transmission) — Continued
b. Two transmissions are used:
• Allison XTG-411 -2A transmission (with engine model 7083-7396) with drive controls and
final drive assemblies.
• Allison XTG-411 -4A transmission (with engine model 7083-7391) with drive controls and
final drive assembles.
Drive control linkages to the transmission are steer control, shift control, and braking. Final drive assemblies
are the interface between the transmission and drive sprockets.
1-13.3 Suspension
independent, torsion-bar mounted, dual-sided road wheels (seven per side), which support and guide the vehicle track.
1-13.4 Air Cleaner Assembly
Provides filtered air to the engine air intake system.
1-14 LOCATION OF MAJOR COMPONENTS
1-14.1 Location of Major Components
NOTE
The primary fuel filter on some M109s is located inside the engine compartment
access door.
LEGEND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1-10
External power receptacle (M109A4/M109A5)
Combat override switch (M109A4/M109A5)
Accessory control box
Cannoneer no. 2 heater (M109A4/M109A5)
Turbocharger
Driver’s seat
Driver’s and portable instrument panels
Drive control
Driver’s heater (M109A4/M109A5)
Batteries (4)
Air purifier (M1 09A4/M109A5)
Rectifier
Master relay
Voltage regulator
Starter relay
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Bilge pump relay
Secondary fuel filter
Oil filters (engine)
Primary fuel filter
Transmission
Coolant surge tank
Fuel tanks and pumps
Bilge pump
Engine
Radiator
Alternator
Fan assembly
Air cleaner
Personnel heater
Fixed fire extinguisher
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